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Among the following four structures I to IV. (i) C2H5-CH(CH3)-C3H7 (ii) CH3-C(=O)-CH(CH3)-C2H5 (iii) CH3OH (iv) C2H5-CH(CH3)-C2H5 It is true that

1. (i) and (iv) are isomers
2. (ii) is an aldehyde
3. (iii) is an alcohol
4. (iv) is 2-methylbutane

Correct answer: (i) and (iv) are isomers

Solution

Structures (i) and (iv) are isomers because they have the same molecular formula (C7H16) but different structural arrangements of their carbon atoms, making them distinct compounds.

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